Synonyms of 'demonstrator'
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Dissenters are people who say that they do not agree with something that other people agree with or that is official policy.
They do not tolerate dissenters in their ranks.
Dissidents are people who disagree with and criticize their government, especially because it is undemocratic.
Thesaurus for demonstrator from the Collins English Thesaurus
Demonstrators are people who are marching or gathering somewhere to show their opposition to something or their support for something.